CONWY, WALES—A construction crew in northern Wales stumbled on a medieval house that could date to the 13th century. Workers from Dwr Cymru Welsh Water uncovered the home and associated artifacts, including pottery, coins, and even portions of a roadway, while installing a sewage pipe. The discovery, said Ashley Batten of the Gwynedd Archaeological Planning Service, “gives us insight into medieval Conwy which may predate the Glndwyr revolt,” in 1401, when the Welsh rose up against the English and the entire town of Conwy was burned to the ground.